Perhaps you should try some spelling variations:
lang van » dang van, tang van, hoang van
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
va tinh » may tinh
va tich » va dich
coc tuc » coc luc, hoc thuc, doc thuc
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
hieu ve » hieu van
van hoi » van hoa, van hoc, van hoe
ky lang » ky nang, ky dang, ky tang
va cua » va chua, via cua, ca cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky lang van hoi. ((hieu ve) or (hieu va)) coc tuc ((va tich) OR (va tinh)) va cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky lang van hoi. ((hieu ve) OR (hieu va)) coc tuc ((va tich) OR (va tinh)) va cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky lang van hoi. ((hieu ve) or (hieu va)) coc tuc ((va tich) OR (va tinh)) va cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky lang van hoi. ((hieu ve) or (hieu va)) coc tuc ((va tich) OR (va tinh)) va cua tre*.